Not okay to discuss your fitness or diet if you are in good shape
Not okay to discuss net worth if it's more than someone else
Not okay to discuss any luxuries
Hm...I dunno. I think luxuries are okay, but the focus here seems to be FI, so if you post about luxuries and aren't FI, you're going to get called out for it.
And the fitness and diet thing, it comes down to being a douche or not.
The honest truth is that people are different.
Someone who is fit, and has always been fit, really probably cannot understand how it is to be fat, and lose weight, and maintain weight loss.
Someone who lost a bunch of weight in their 20's, probably cannot understand how hard it is in your 50's.
I got into a really long crazy thread about weight loss here where one guy was busting on me for being fat and lazy and stupid (okay, I'll cop to fat, but not the others), when the fact is, he's just a jerk who has never been in my shoes. Eventually I had to detail exactly what I was eating, the exercise I was doing, my age, my lack of sleep, etc. ALL those things are factors, and if you've never tweaked this, and that for a year to lose 10 lbs, 20 lbs, 100 lbs whatever - you can't REALLY understand.
It doesn't mean you stay out of it. It means you can say "this worked for me" - which may give someone a new idea to try. It means you DON'T say "you lazy butt, if you just do this you'd be thin!"
I'm not sure if that makes any sense. I love reading about other peoples fitness journeys, but as a mid-40's, full time working mother of 2 (who had her second baby at 42), a LOT of it doesn't apply to me. Time, kids, sleep, joints - I can't eat that many carbs anymore, I can't run anymore (no more 1/2 marathons for me), and I may never be a "normal weight". I'm about 8 lbs overweight now, and my experimentation over the last year (and 25 lbs of weight loss, give or take) are showing me that it is probably going to take Herculean efforts to lose 8 more pounds.